Screw-threaded connecting means



May 2, 1939. w. HEYNER ET AL I SCREW-THREADED CONNECTING MEANS FiledOct. 8, 1937 Patented May 1939 UNITED STATES SCREW-THREADED CONNECTINGMEANS -Willi Beyner and Hermann Henkel, Berlin- Neukolln, GermanyApplication October 8, In Germany 19:1. Serial No. 188,041 May 22, 19311.01am (Cl. 85-2.!)

Our invention relates to screw connections and more especially to meansfor fixing parts to thin plates, ior instance plywood sheets, by meansof screws.

The invention is more particularly concerned with means for providingsuch plates, or other 7 articles such as rods, with metallic screwthreading as required for instance in the construction of furniture,toys, etc.

According to this invention the internally threaded female part or nutis combined with a sleeve serving to fix it in a hole or perioration ofthe part to be connected, the fixing in place being eiiected by means ofa tool of special design. as

" will hereinafter be described morefully with rei'- erence to thedrawing ailixed'to this specification and forming part thereof, in whichembodic nut, while Fig. 2 is a similar view of the sleeve shaped Dartdesigned to cooperate with and to fix in place the 25 nutin the sheet,rod or the like to be provided with screw threading. Fig. 3 is an axialsection showing the two parts, illustrated in Figs. 1 and 2 connectedwith each other and fixed in a perforation of a wooden 30 sheet, while IFix. 4 is an elevation. partly in axial section. of the tool. a a

Referring to the drawing andfirst to Figs! to3,listhenutand2istheinternalscrewthread 85 formed thereon, while I isthe gradually flaring head and 4 a projection of smaller diameter formedon the side or the nut opposite thehead. I is a transverse notch formedin the projection I andtisa mbstantiallyaxiallyextendingnotch which maybe formed in the eircumierential part of the nut.

I is the sleeve, the inner diameter of which is slightly larger than theouter diameter oithe main part of the nut i. The extension I on one sideoi the sleeve 1 projects inwardly to the extent of closely fitting onthe projecting part I of the nut. The other end of the sleeve is formedwith flaring tongues I separated cuts i0.

The nut and sleeve a wooden sheet by means of theltool shown inFig.4,inwhich Ii isaboitiormed withhhead II at one end and a pin it atthe other end, this bolt fittinginasleevelloi' substantiallyequal'bynarrow gapsor cinnamon-renames length and being supported with itshead some- -what above the top end of the sleeve ll by a coil spring itencircling the bolt ii and resting with one end against the head I! andwith the other 'end against the bottom of a circular groove II 5 formedin the top of the sleeve ll. I1 is an axially extending groove formed inthe circumferential part of the bolt ii and I8 is a set screw extendingthrough a hole in the wall of sleeve i4 and projecting into the grooveiito 10 .limit the stroke of the bolt Ii. I! is a flange surrounding thebottom end oi the sleeve i4 and "is a spherical check, slightlyprojecting into the boring of the sleeve I4 and forced into opera- .tiveposition by a coil spring 2i inserted in a radial bore 22 in the flangeiI.

In order to fix the parts I and i in thepertoration of a plywood sheet23, the nut I is inserted in the sleeve as shown in Fig. 3 and placedwith its head foremost in the boring oi the tool It, the 90 pin itserving to center it therein and the ball check 20 retaining the partsin the boring by projecting below the flaring head 3 of the nut. Thetool being then placed above the perforation in the sheet of wood, ahammer blow delivered 85 i on the head i2 01' the bolt ii will force thenut into the sleeve, the flaring portion 3 of the head 0! the nutforcing the tongues l of sleeve I outwardly and thereby riveting thesleeve 1 to the sheet of wood. At the same time the sleeve 1 being upsetby the blow will interlock with the nut I in that part of thewallmaterial of the sleeve, in bulging inwardly, will enter the notch 0formed in the nut, thereby retaining the nut in the sleeve. Q86

Wewishittobeunderstood thatwedo not desiretobelimitedtotheexactdetailsofconstruction shown and described for obvious modificationswill occur to a person skilled in the art.

We claim: Threaded metal member adapted for attachment to thinsheets,rods or the like, comprising in combination a metal sleeve, one end ofsaid sleeve being thinned and slotted to form a circle or tongues and aninternally threaded nut formed 45 with an outwardly flaring head fittingin the sleeve and, below said head, with an axially extendingnotchadapted to form an interlocking connection between said nut and saidsleeve. whenthisiatterisupsetbyanaxiallydirectedso hammerblow and partof the sleeve material -enterssaidnotch. v

- Wild-1m BIRI|.ANN

